CN110419139B - Battery pack and method for manufacturing same - Google Patents

Battery pack and method for manufacturing same Download PDF

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Publication number
CN110419139B
CN110419139B CN201880017682.3A CN201880017682A CN110419139B CN 110419139 B CN110419139 B CN 110419139B CN 201880017682 A CN201880017682 A CN 201880017682A CN 110419139 B CN110419139 B CN 110419139B
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China
Prior art keywords
pcb
battery cell
case
battery pack
battery
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CN201880017682.3A
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Chinese (zh)
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CN110419139A (en
Inventor
李范植
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Lg Energy Solution
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LG Energy Solution Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/647—Prismatic or flat cells, e.g. pouch cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/202—Casings or frames around the primary casing of a single cell or a single battery
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/271—Lids or covers for the racks or secondary casings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/284—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with incorporated circuit boards, e.g. printed circuit boards [PCB]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/296—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by terminals of battery packs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Battery Mounting, Suspending (AREA)
  • Secondary Cells (AREA)

Abstract

The present invention relates to a battery pack and a method of manufacturing the same, and more particularly, to a battery pack including a top cap having a hook protrusion for protecting a PCB connected to a pouch type battery cell, and a method of manufacturing the same.

Description

Battery pack and method of manufacturing the same
Technical Field
The present invention relates to a battery pack and a method of manufacturing the same, and more particularly, to a battery pack including a top cap having a hook protrusion for protecting a PCB connected to a pouch type battery cell, and a method of manufacturing the same.
Background
Typical battery packs are lithium secondary batteries and are classified into a cylindrical type, a prismatic type, and a pouch type according to the shape of a battery case.
Among them, a pouch type lithium secondary battery (hereinafter, referred to as a battery pack) has flexibility, also has a relatively free shape, is light in weight, and has excellent safety, and thus, there is an increasing demand for portable electronic devices such as mobile phones, camcorders, and notebook computers.
The battery pack contains various flammable materials, and thus, the battery pack has a serious defect in safety due to overcharge, overcurrent, other physical external impacts, etc., causing heat generation and explosion.
Thus, the battery pack is provided with a Protection Circuit Module (PCM) for continuously detecting values such as voltage, current, and Temperature and effectively controlling an abnormal state determined based on the detected values, and safety elements such as a fuse-type Positive Temperature Coefficient (PTC) element and a Thermal Cut-off (TCO) device.
The PCM is disposed on a Printed Circuit Board (PCB), which is electrically connected to the battery cell by welding or soldering.
Since the safety element including the PCM must be electrically connected to the electrode terminals of the battery cell while being maintained to be electrically insulated from the other parts of the battery cell. Thereby, an insulating tape is attached to each member including the PCM.
However, this insulating tape attaching method is very troublesome and has no other function than insulation.
In order to solve the above problem, as shown in fig. 1, an upper case according to the related art is used.
Fig. 1 is a schematic diagram showing the structure of a battery pack provided with an upper case.
Referring to fig. 1, an upper case provided in a battery pack according to the related art surrounds front and rear surfaces of a PCB connected to the upper end of a battery cell.
Furthermore, the upper housing is made of an electrically insulating material. Unlike the insulating tape attaching method, the upper case may be simply mounted or attached to the upper end of the battery cell, and the upper case may protect the PCB even if an external impact is applied.
However, since the upper case has an open top surface, foreign substances may be introduced thereto. In addition, since the upper case is manually mounted or attached like the insulating tape attaching method, a lead time required to produce the battery pack is increased.
Thus, it is required to develop a technology for preventing foreign substances from being introduced into the upper case protecting the PCB and reducing the delivery time of the battery pack.
[ Prior art documents ]
[ patent document ]
(patent document 1) KR1023898B
Disclosure of Invention
Technical problem
The present invention provides a battery pack that protects a Printed Circuit Board (PCB) and has a lead time less than a conventional lead time, and a method of manufacturing the same.
Technical scheme
The battery pack according to an embodiment of the present invention includes: a battery cell; a battery cell case, an upper portion of which includes a PCB receiving portion and a case lead portion electrically connected to a tab of a battery cell; a Printed Circuit Board (PCB) including a protection circuit for controlling the operation of the battery cell, the PCB being mounted in a PCB receiving part provided at an upper portion of the battery cell case so as to be coupled to the battery cell case; and an insulating top cover provided with a pair of hook-shaped protrusions on both end surfaces thereof so as to be press-fitted to the PCB, the insulating top cover being coupled to the PCB to face the PCB receiving part, thereby covering the entire surface of the PCB mounted in the PCB receiving part.
In a region not overlapping with the PCB receiving part, the battery cell case may have a battery cell receiving region receiving the battery cell.
The top cover may include a plurality of ribs protruding from an inner periphery of the top cover to provide separation walls between electronic components disposed on the PCB when the top cover is coupled to the PCB.
The height of each rib may correspond to a difference between the height of the battery cell case and the height of the PCB mounted in the PCB receiving part.
Each of the hooking protrusions of the top cover may be determined at a position such that the hooking protrusion is disposed at a position corresponding to a sum of a height of each of the ribs and a thickness of the PCB mounted in the PCB receiving part.
The top cover may include a front part in which a through groove through which the external input/output terminal extends to the outside may be defined, a side part, and a top part.
A heat dissipation hole for dissipating heat generated from the positive (+) electrode/negative (-) electrode lead may be defined in the front part of the top cover, and the heat dissipation hole may be provided to allow a portion of the front part to maintain a predetermined height so as to prevent the positive (+) electrode/negative (-) electrode lead from protruding to the outside.
The top cover may further include a rear member as a coupling reinforcing member to increase a coupling force with the battery cell.
The method for manufacturing a battery pack according to an embodiment of the present invention includes: a cell preparation step for preparing a cell having a sealed pouch type; a PCB connecting step for connecting the PCB including the protection circuit to the battery cell prepared in the battery cell preparing step; and a top cover coupling step for press-fitting a top cover to the PCB connected to the battery cell in the PCB connecting step.
The method further includes, before the PCB connecting step, an input/output terminal connecting step for connecting an external input/output terminal to the PCB.
The method further includes, before the PCB connecting step, a battery cell coupling step for mounting the battery cell prepared in the battery cell preparing step in a battery cell receiving portion of a battery cell case including a battery cell receiving portion, a case lead portion, and a PCB receiving portion to electrically couple tabs of the mounted battery cell to the case lead portion of the battery cell case.
The case lead part of the battery case may be bent toward the inside of the PCB receiving part, over which the PCB is coupled, before the PCB connection step.
Advantageous effects
In the battery pack and the method of manufacturing the same according to the embodiment of the present invention, the top surface of the upper case protecting the PCB may be provided to prevent foreign substances from being introduced, and the hook-shaped protrusions may be formed on both surfaces of the upper case so that an automatic process can be performed to rapidly manufacture the battery pack.
Drawings
Fig. 1 is a schematic view of a battery pack structure provided with an upper case.
Fig. 2 is an exploded perspective view of a battery pack according to an embodiment of the present invention.
Fig. 3 is an overall sectional view of a top cap in a battery pack according to an embodiment of the present invention.
Fig. 4 is a perspective view illustrating the inside of a top cap in a battery pack according to an embodiment of the present invention.
Fig. 5 is an enlarged view of a hook protrusion in the battery pack according to an embodiment of the present invention.
Fig. 6 is a schematic view illustrating a method for manufacturing a battery pack according to an embodiment of the present invention.
Fig. 7 is an assembled side view of a top cover in a battery pack according to an embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the following examples. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Also, it will be understood that although sequential numbers such as first and second are used herein to describe various elements, these elements are not limited by these numbers. The terminology is used only to distinguish one element from another. For example, a first element, referred to as a first element in one embodiment, may be termed a second element in another embodiment, without departing from the scope of the appended claims. In the following description, technical terms are used to explain specific exemplary embodiments, not to limit the present invention. Singular terms may include the plural unless indicated to the contrary.
Although terms used in the present invention are selected from general terms that are currently widely used in consideration of functions of the present invention, it is understood that the terms may be changed according to intentions or cases of those skilled in the art, the emergence of new technology, and the like. Also, in some cases, there may be terms arbitrarily selected by the applicant, and in such cases, the meanings thereof will be specifically described in the description of the corresponding invention. Thus, the terms used in the present invention should be defined based on their meanings, and the terms are not defined based on the names of simple terms but are defined based on the overall contents of the present invention.
< example 1>
Hereinafter, a battery pack according to an embodiment of the present invention will be described.
The battery pack according to the embodiment of the present invention is constructed of a battery cell, a PCB having a protection circuit, and a top cover having a closed top surface and provided with a hook protrusion, the top cover being press-fitted to the PCB to prevent the PCB from being damaged by external impact.
Fig. 2 is an exploded perspective view of a battery pack according to an embodiment of the present invention.
Referring to fig. 2, a battery pack according to an embodiment of the present invention includes: a battery cell 111; a battery cell case 110, the battery cell case 110 including a PCB receiving portion and a case lead portion electrically connected to the battery cell tab at an upper portion thereof; a Printed Circuit Board (PCB) 120 including a protection circuit for controlling the operation of the battery cell 110, the Printed Circuit Board (PCB) 120 being mounted in a PCB receiving part provided at an upper portion of the battery cell case 110 so as to be coupled to the battery cell case; and an insulating top cover 130, the insulating top cover 130 being provided with a pair of hook-shaped protrusions on both end surfaces so as to be press-fitted to the PCB120, the insulating top cover being coupled to face the PCB receiving part so as to cover the entire surface of the PCB mounted in the PCB receiving part.
Also, each constituent part of the battery pack will be described in more detail below.
Since the battery cell 111 generally uses a lithium secondary battery, the battery cell has a structure in which a plurality of positive electrodes (aluminum foils) and negative electrodes (copper foils) are stacked with separators interposed therebetween to form an electrode assembly.
Also, the positive electrode tab is welded to the positive electrode, and the negative electrode tab is welded to the negative electrode. The entire electrode assembly except for the positive electrode tab and the negative electrode tab was wrapped with an aluminum pouch to constitute a sealed battery cell 111.
Also, the aluminum pouch wrapping the electrode assembly is manufactured based on a high toughness and a thin aluminum layer, and the battery cell 111 may be configured to maintain the shape of the electrode assembly and protect the inside thereof from external impacts by additionally installing the battery cell case 110.
Also, in the battery cell 111, the aluminum pouch may constitute the battery cell case 110 without a separate other case.
Also, the battery cell case 110 includes a PCB receiving portion 112 and a case lead portion 113 electrically connected to a tab of the battery cell at an upper portion thereof. In the PCB receiving part 112, left and right sides of the upper end of the battery cell case may extend further than the PCB such that the PCB is received in the upper end of the battery cell case.
Also, the battery cell 111 is accommodated in a battery cell accommodation region of the battery cell case 110, which is provided in a region not overlapping with the PCB accommodation portion 112.
Also, the PCB receiving portion 112 may be maintained in an insulating state by using an insulating material such as an insulating tape.
Also, the case lead portion 113 of the battery cell case is electrically connected to the tab of the battery cell. The constituent members extending from the case lead portion 113 to the inside of the battery cell case may be welded to the tabs of the battery cell such that the battery cell and the case are electrically connected to each other.
The PCB120 includes a protection circuit for controlling the operation of the battery cell 111 and is mounted in a PCB receiving part 112 provided at an upper portion of the battery cell case 110. The PCB may be electrically connected to the battery cell 111 to prevent the battery cell 111 from being overcharged, overdischarged, or overheated and from exploding due to overcurrent.
Also, the PCB120 may include a safety element including a passive element such as a resistor and a condenser, or an active element such as a field effect transistor or a protection element in which an integrated circuit is provided, and the PCB120 may include an external input/output terminal 140 electrically connected to an external device to receive power from the battery pack 100.
Here, the shape of the external input/output terminal 140 is not limited to fig. 2, and may be variously changed according to user demands.
Also, a pair of hooking protrusions 131 may be provided on both end surfaces of the top cover 130 to be press-fitted to the PCB, and the top cover is coupled to face the PCB receiving part 112, thereby covering the entire surface of the PCB mounted in the PCB receiving part 112. The top cover 130 may be made of an electrically insulating material.
More specifically, the top cover 130 may be made of a polymer material having low conductivity or paper. The polymeric material may include one or more of the following materials: polyethylene (PE), polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET), polyamide (PA, nylon), polyester (polyester, PEs), polyvinyl chloride (PVC), polyurethane (PU), polycarbonate (PC), polyvinylidene chloride (PVDC), polytetrafluoroethylene (PTFE, teflon), polyether ether ketone (PEEK, polyketone), and polyetherimide (PEI, ultem).
Also, the top cap 130 may have a major axis having a length less than that of the battery cell housing 110 and a minor axis having a length greater than that of the PCB120.
Also, since the number of production can be increased from 4 to 8 sheets per 1 mold to 16 sheets per 1 mold, the manufacturing cost of the top cover 130 can be reduced.
Also, the constituent components of the top cover 130 will be described in more detail with reference to fig. 3 to 5.
Fig. 3 is an overall sectional view illustrating a top cap in a battery pack according to an embodiment of the present invention.
Fig. 4 is a perspective view illustrating the inside of a top cap in a battery pack according to an embodiment of the present invention. That is, in order to facilitate understanding of the structure thereof, fig. 4 is a block diagram illustrating components in which the top cover 130 of fig. 3 is coupled except for the rear component (d of fig. 3).
Fig. 5 is an enlarged view of a hook protrusion in the battery pack according to an embodiment of the present invention.
Referring to fig. 3, the top cover 130 includes a front member (a of fig. 3), a top member (b of fig. 3), side members (c of fig. 3), and a rear member (d of fig. 3).
Referring to fig. 4, the components of fig. 3 are assembled by a general assembly method such as press fitting, welding, adhesive bonding, etc.
Also, referring to fig. 4, the top cover 130 includes a pair of hooked protrusions 131 provided on the side members (c of fig. 3), a plurality of ribs 132 provided inside the top member (b of fig. 3) and the front member (a of fig. 3), a through groove 133 defined in the front member (a of fig. 3), and a pair of heat dissipation holes 134 defined in the front member (a of fig. 3).
Also, referring to fig. 4 and 5, a pair of hooking protrusions 131 is configured to stably fix the top cover 130 to the PCB120. Thus, when the battery pack 100 drops, the frequency of separation of the PCB120 is reduced, and the PCB120 can be more stably protected than the conventional structure.
Also, a pair of hooking protrusions 131 are provided symmetrically to each other on the side member (c of fig. 3). Each of the pair of hook protrusions 131 has a triangular shape protruding toward the inside of the top cap, but the embodiment is not limited thereto.
Also, the hooking protrusion 131 may be determined at a position such that the hooking protrusion 131 is disposed at a position corresponding to the sum of the height of the rib 132 and the thickness of the PCB120 mounted in the PCB receiving part 112. Here, the position of the hook protrusion means the position of the bottom surface (the bottom surface of the triangle in fig. 5) of the hook protrusion.
Also, a plurality of ribs 132 are protruded to the inside of the topper (b of fig. 3) and the front part (a of fig. 3). The plurality of ribs 132 may provide a separation wall between electronic components provided on the PCB120 for Electrostatic Discharge (ESD) when the top cover is coupled to the PCB120.
Also, since the plurality of ribs 132 are provided at positions where the safety elements and the protection elements on the PCB120 are not provided, the positions of the ribs 132 may be changed according to the types, the number, and the positions of the safety elements and the protection elements provided on the PCB120.
Also, each of the plurality of ribs 132 may be disposed at a height corresponding to a difference between the height of the battery cell case 110 and the height of the PCB120 mounted in the PCB receiving part 112 such that the flatness of the battery cell case 110 and the top cover 130 are matched with each other.
Also, four ribs 132 are provided as an example, but not limited thereto.
Also, a through groove 133 is defined in the front part (a of fig. 3) such that the external input/output terminal 140 connected to the PCB120 passes outside the top cover 130.
Also, a pair of heat dissipation holes 134 are defined in the front part (a of fig. 3) to dissipate heat generated from the positive (+) electrode/negative (-) electrode lead of the battery cell case.
In general, the heat dissipation holes 134 are provided to allow a portion of the front part (a of fig. 3) to maintain a predetermined height such that a portion of a hole, which is completely opened due to heat generated from the positive (+) electrode/negative (-) electrode lead, is partially suspended on each of the positive (+) electrode/negative (-) electrode leads.
Thereby, the heat dissipation holes 134 reduce heat generated in the positive (+) electrode/negative (-) electrode lead and prevent the positive (+) electrode/negative (-) electrode lead from being protruded to the outside due to various reasons such as the dropping of the battery pack 100.
Also, the top cap 130 may be a coupling reinforcing member for increasing a coupling force with the battery cell, and may additionally include a rear member (d of fig. 3).
Also, the rear member (d of fig. 3) may be provided to have a short axis length corresponding to the sum of the height of each rib 132 and the thickness of the PCB120 itself, so that the top cover 130 and the PCB120 may be more stably coupled to each other.
< example 2>
Hereinafter, a method for manufacturing a battery pack according to an embodiment of the present invention will be described.
In the method for manufacturing a battery pack according to the embodiment of the present invention, a battery cell is prepared, and a Printed Circuit Board (PCB) is bonded to the prepared battery cell. Thereafter, the top cap is press-fitted to the joined PCBs to manufacture the battery pack protecting the PCBs.
Fig. 6 is a schematic view illustrating a method for manufacturing a battery pack according to an embodiment of the present invention.
Referring to fig. 6, a method for manufacturing a battery pack according to an embodiment of the present invention includes: a process of preparing a battery cell having a pouch type (a battery cell preparing step: S510), and a process of connecting a PCB including a protection circuit to the battery cell prepared in the battery cell preparing step (S510) (a PCB connecting step: S520).
In the PCB connection step (S520), a top cover is press-fitted to the PCB connected to the battery cell (top cover coupling step: S530).
Also, each step in the method for manufacturing the battery pack will be described in more detail below.
The cell preparation step (S510) is a step of preparing a cell having a sealed pouch type. Here, various pouch type battery cells, such as lithium polymer batteries, nickel cadmium batteries, nickel hydrogen batteries, nickel zinc batteries, and the like, and lithium ion batteries, may be prepared.
For example, in a process of manufacturing a lithium ion battery, a plurality of positive electrodes (aluminum foils) and negative electrodes (copper foils) may be stacked with a separator interposed between the positive and negative electrodes to form a battery cell.
Thereafter, the positive electrode tab is welded to the positive electrode and the negative electrode tab is welded to the negative electrode. Thereafter, the positive and negative electrodes were wrapped by aluminum pouches to achieve a sealed structure.
More specifically, the process of manufacturing the battery cell is generally divided into three processes, such as an electrode process, an assembly process, and an activation process. In the electrode process, materials for forming the positive electrode and the negative electrode are mixed in an appropriate ratio, followed by coating the positive electrode with aluminum and coating the negative electrode with copper foil.
Thereafter, the obtained product was pressed flat by rolling to a fixed thickness; a scoring process is then performed to cut the resulting product to facilitate electrode size matching.
Also, in the assembly process, a grooving process for removing unnecessary portions of the electrodes is performed, and the positive electrode material, the separator, and the negative electrode material are alternately laminated on top of each other. Thereafter, a stacking and folding process of folding the product several times according to the battery capacity, or a winding process of overlapping and rolling (stack & folding) the electrode and the separator is performed.
Thereafter, the product is encapsulated by using an aluminum film package, an electrolyte is injected, and a sealing process for forming a vacuum state is performed.
Finally, in the activation (formation) process, the assembled battery cell repeats charge and discharge to activate the battery cell. The activation process is a process for performing a degassing treatment for discharging gas generated at the time of activation of the battery cell.
Also, after the battery cell is prepared, a battery cell coupling step for mounting the battery cell prepared in the battery cell preparing step (S510) in the battery cell receiving part and electrically coupling the tab of the mounted battery cell and the case lead part 113 of the battery cell case to each other is additionally performed to the battery cell case.
The battery cell case is maintained in the form of an electrode assembly simply encapsulated by packaging with an aluminum film, and the interior thereof is protected from external impacts, whereby the battery cell is mounted with the battery case.
Thereby, the battery cell is mounted in the battery cell receiving portion provided below the battery cell case, and the tab drawn from the battery cell is connected to the case lead portion provided on the battery cell case via welding. Thereafter, the upper side of the battery cell case is covered to complete the assembly process.
Also, the PCB connecting step (S520) is a step of connecting the PCB120 including the protection circuit to the battery cell prepared in the battery cell preparing step (S510). Here, the lead wire drawn from the battery cell case 110 is coupled to the PCB120 via spot welding or soldering.
More specifically, since the PCB120 must be located in the PCB receiving part 112 inside the battery cell case, the positive (+) lead/negative (-) lead of the lead part 113 inside the battery cell case is bent toward the PCB receiving part 112.
An electrical insulator is provided inside the bend of the lead to adjust the lead height, after which the lead is coupled to the PCB120.
Also, before the PCB120 is connected, an input/output terminal connection step for previously connecting the external input/output terminals 140 provided on the PCB120 is performed to quickly perform a process.
Also, the top cover coupling step (S530) is a step for press-fitting the top cover to the PCB120 connected to the battery cell in the PCB connecting step (S520). This step will be described in more detail below.
Fig. 7 is an overall side view of a top cap in a battery pack according to an embodiment of the present invention.
Referring to fig. 7, the top cover 130 is press-fitted to the PCB120. This may be achieved by means of an automatic coupling using a clamp, or may be achieved manually.
Also, after the top cap coupling step (S530), a label wrapping step for wrapping the outer surfaces of the battery cells is performed on the battery pack 100 such that the battery pack maintains an insulated state in which static electricity is prevented from being introduced from the outside, and the entire constituent components of the battery pack are fixed.
[ description of symbols ]
100: battery pack
110: battery cell housing
111: battery unit
112: PCB accommodating part
113: lead part of housing
120：PCB
130: top cover
131: hook-shaped projection
132: rib arch
133: through trench
134: heat dissipation hole

Claims (10)

1. A battery pack, comprising:
a battery cell;
a battery cell case, an upper portion of which includes a PCB receiving portion and a case lead portion electrically connected to a tab of the battery cell;
a Printed Circuit Board (PCB) including a protection circuit for controlling the operation of the battery cell, the PCB being mounted in a PCB receiving part provided at an upper portion of the battery cell housing so as to be coupled to the battery cell housing; and
an insulative top cap including a front part, two side parts, and a top part, the two side parts of the insulative top cap being provided with a pair of hook-shaped protrusions thereon so as to be press-fitted to the PCB, the insulative top cap being coupled to the PCB to face the PCB receiving part so as to cover an entire surface of the PCB mounted in the PCB receiving part,
wherein the top cover includes a plurality of ribs protruding from an inner periphery of the top cover to provide separation walls between electronic components disposed on the PCB when the top cover is coupled to the PCB,
wherein each of the hooking protrusions of the top cover is provided at a position corresponding to a sum of a height of each of the ribs and a thickness of the PCB mounted in the PCB receiving part.
2. The battery pack according to claim 1, wherein the battery cell case has a battery cell receiving region in which the battery cell is received, in a region that does not overlap with the PCB receiving part.
3. The battery pack according to claim 1, wherein a height of each rib corresponds to a difference between a height of the battery cell case and a height of the PCB mounted in the PCB receiving part.
4. The battery pack according to claim 1, wherein a through groove is defined in the front member, and the external input/output terminal extends to the outside through the through groove.
5. The battery pack according to claim 1, wherein heat dissipation holes for dissipating heat generated from the positive (+) electrode/negative (-) electrode lead are defined in a front part of the top cap,
the heat dissipation holes are provided to allow a portion of the front part to maintain a predetermined height to prevent the plus (+) electrode/minus (-) electrode lead from protruding to the outside.
6. The battery pack according to claim 1, wherein the top cover further comprises a rear member as a coupling reinforcing member that increases a coupling force with the battery cell.
7. A method for manufacturing the battery pack of claim 1, the method comprising:
a cell preparation step for preparing a cell having a sealed pouch type;
a PCB connecting step for connecting the PCB including the protection circuit to the battery cell prepared in the battery cell preparing step; and
a top cover coupling step for press-fitting the top cover to the PCB connected to the battery cell in the PCB connecting step.
8. The method of claim 7, further comprising: an input/output terminal connecting step for connecting an external input/output terminal to the PCB before the PCB connecting step.
9. The method of claim 7, further comprising: a battery cell coupling step, prior to the PCB connection step, for mounting the battery cell prepared in the battery cell preparation step in a battery cell receiving portion of a battery cell case including a battery cell receiving portion, a case lead portion, and a PCB receiving portion to electrically couple tabs of the mounted battery cell to the case lead portion of the battery cell case.
10. The method of claim 7, wherein the case lead part of the battery cell case is bent toward the inside of the PCB receiving part and the PCB is coupled thereto, prior to the PCB connecting step.
CN201880017682.3A 2017-05-04 2018-02-08 Battery pack and method for manufacturing same Active CN110419139B (en)

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PCT/KR2018/001706 WO2018203593A1 (en) 2017-05-04 2018-02-08 Battery pack and manufacturing method therefor

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WO2018203593A1 (en) 2018-11-08
JP2019537825A (en) 2019-12-26
KR102221780B1 (en) 2021-03-02
EP3531495B1 (en) 2023-01-11
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CN110419139A (en) 2019-11-05
US20200014081A1 (en) 2020-01-09

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